Adding the ability to pause and resume live tiles.

This is a simple adjustment to the live-tiles to allow the ability to
pause and resume the animations. This also removes the reinitLives()
function which was in the global scope and didn’t clear the setInterval
timer.

I decided to add this because I needed a way to pause the tiles while on-hover ... Also for performance reasons I needed tiles to pause while outside of the viewport.

Now a tile can be pause by using:
el.livetile('stop');

and restarted with:
el.livetile('start');